Ep. 55: The Tragedy of a Stormy Night

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It is shown that Sojiro was treated as a servant to his family, one that never showed him respect or affection. He later meets Shishio, who kindly spared his life. After learning how cruel Sojiro's family is to him, Shishio offers him the Wakizashi sword. When Sojiro is soon cornered by his family, he uses the sword to murder them all. Sojiro follows Shishio, as Shishio tells Sojiro that he will become strong. (Source: Wikipedia)